blob: 37dd6b05b1b5bfe2b794123f3fac1eb5260e91ea [file] [log] [blame]
Ryusuke Konishid2500652009-04-06 19:01:34 -07001/*
2 * namei.c - NILFS pathname lookup operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>,
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23/*
24 * linux/fs/ext2/namei.c
25 *
26 * Copyright (C) 1992, 1993, 1994, 1995
27 * Remy Card (card@masi.ibp.fr)
28 * Laboratoire MASI - Institut Blaise Pascal
29 * Universite Pierre et Marie Curie (Paris VI)
30 *
31 * from
32 *
33 * linux/fs/minix/namei.c
34 *
35 * Copyright (C) 1991, 1992 Linus Torvalds
36 *
37 * Big-endian to little-endian byte-swapping/bitmaps by
38 * David S. Miller (davem@caip.rutgers.edu), 1995
39 */
40
41#include <linux/pagemap.h>
42#include "nilfs.h"
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090043#include "export.h"
Ryusuke Konishid2500652009-04-06 19:01:34 -070044
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090045#define NILFS_FID_SIZE_NON_CONNECTABLE \
46 (offsetof(struct nilfs_fid, parent_gen) / 4)
47#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
Ryusuke Konishid2500652009-04-06 19:01:34 -070048
49static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
50{
51 int err = nilfs_add_link(dentry, inode);
52 if (!err) {
53 d_instantiate(dentry, inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -080054 unlock_new_inode(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -070055 return 0;
56 }
57 inode_dec_link_count(inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -080058 unlock_new_inode(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -070059 iput(inode);
60 return err;
61}
62
63/*
64 * Methods themselves.
65 */
66
67static struct dentry *
Al Viro00cd8dd2012-06-10 17:13:09 -040068nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Ryusuke Konishid2500652009-04-06 19:01:34 -070069{
70 struct inode *inode;
71 ino_t ino;
72
73 if (dentry->d_name.len > NILFS_NAME_LEN)
74 return ERR_PTR(-ENAMETOOLONG);
75
Al Viro03190032010-01-31 21:02:09 -050076 ino = nilfs_inode_by_name(dir, &dentry->d_name);
Al Viroa9049372011-07-08 21:20:11 -040077 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
Ryusuke Konishid2500652009-04-06 19:01:34 -070078 return d_splice_alias(inode, dentry);
79}
80
Ryusuke Konishid2500652009-04-06 19:01:34 -070081/*
82 * By the time this is called, we already have created
83 * the directory cache entry for the new file, but it
84 * is so far negative - it has no inode.
85 *
86 * If the create succeeds, we fill in the inode information
87 * with d_instantiate().
88 */
Al Viro4acdaf22011-07-26 01:42:34 -040089static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040090 bool excl)
Ryusuke Konishid2500652009-04-06 19:01:34 -070091{
92 struct inode *inode;
93 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -070094 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -070095
96 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
97 if (err)
98 return err;
99 inode = nilfs_new_inode(dir, mode);
100 err = PTR_ERR(inode);
101 if (!IS_ERR(inode)) {
102 inode->i_op = &nilfs_file_inode_operations;
103 inode->i_fop = &nilfs_file_operations;
104 inode->i_mapping->a_ops = &nilfs_aops;
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900105 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700106 err = nilfs_add_nondir(dentry, inode);
107 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700108 if (!err)
109 err = nilfs_transaction_commit(dir->i_sb);
110 else
111 nilfs_transaction_abort(dir->i_sb);
112
113 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700114}
115
116static int
Al Viro1a67aaf2011-07-26 01:52:52 -0400117nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700118{
119 struct inode *inode;
120 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700121 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700122
123 if (!new_valid_dev(rdev))
124 return -EINVAL;
125
126 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
127 if (err)
128 return err;
129 inode = nilfs_new_inode(dir, mode);
130 err = PTR_ERR(inode);
131 if (!IS_ERR(inode)) {
132 init_special_inode(inode, inode->i_mode, rdev);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900133 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700134 err = nilfs_add_nondir(dentry, inode);
135 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700136 if (!err)
137 err = nilfs_transaction_commit(dir->i_sb);
138 else
139 nilfs_transaction_abort(dir->i_sb);
140
141 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700142}
143
144static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
145 const char *symname)
146{
147 struct nilfs_transaction_info ti;
148 struct super_block *sb = dir->i_sb;
149 unsigned l = strlen(symname)+1;
150 struct inode *inode;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700151 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700152
153 if (l > sb->s_blocksize)
154 return -ENAMETOOLONG;
155
156 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
157 if (err)
158 return err;
159
160 inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
161 err = PTR_ERR(inode);
162 if (IS_ERR(inode))
163 goto out;
164
165 /* slow symlink */
166 inode->i_op = &nilfs_symlink_inode_operations;
167 inode->i_mapping->a_ops = &nilfs_aops;
168 err = page_symlink(inode, symname, l);
169 if (err)
170 goto out_fail;
171
172 /* mark_inode_dirty(inode); */
Jiro SEKIBA9ca941d2009-11-27 19:41:06 +0900173 /* page_symlink() do this */
Ryusuke Konishid2500652009-04-06 19:01:34 -0700174
175 err = nilfs_add_nondir(dentry, inode);
176out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700177 if (!err)
178 err = nilfs_transaction_commit(dir->i_sb);
179 else
180 nilfs_transaction_abort(dir->i_sb);
181
182 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700183
184out_fail:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900185 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900186 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800187 unlock_new_inode(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700188 iput(inode);
189 goto out;
190}
191
192static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
193 struct dentry *dentry)
194{
David Howells2b0143b2015-03-17 22:25:59 +0000195 struct inode *inode = d_inode(old_dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700196 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700197 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700198
Ryusuke Konishid2500652009-04-06 19:01:34 -0700199 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
200 if (err)
201 return err;
202
203 inode->i_ctime = CURRENT_TIME;
204 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400205 ihold(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700206
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800207 err = nilfs_add_link(dentry, inode);
208 if (!err) {
209 d_instantiate(dentry, inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700210 err = nilfs_transaction_commit(dir->i_sb);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800211 } else {
212 inode_dec_link_count(inode);
213 iput(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700214 nilfs_transaction_abort(dir->i_sb);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800215 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700216
217 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700218}
219
Al Viro18bb1db2011-07-26 01:41:39 -0400220static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700221{
222 struct inode *inode;
223 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700224 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700225
Ryusuke Konishid2500652009-04-06 19:01:34 -0700226 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
227 if (err)
228 return err;
229
Jiro SEKIBA565de402009-11-27 19:41:08 +0900230 inc_nlink(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700231
232 inode = nilfs_new_inode(dir, S_IFDIR | mode);
233 err = PTR_ERR(inode);
234 if (IS_ERR(inode))
235 goto out_dir;
236
237 inode->i_op = &nilfs_dir_inode_operations;
238 inode->i_fop = &nilfs_dir_operations;
239 inode->i_mapping->a_ops = &nilfs_aops;
240
Jiro SEKIBA565de402009-11-27 19:41:08 +0900241 inc_nlink(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700242
243 err = nilfs_make_empty(inode, dir);
244 if (err)
245 goto out_fail;
246
247 err = nilfs_add_link(dentry, inode);
248 if (err)
249 goto out_fail;
250
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900251 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700252 d_instantiate(dentry, inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800253 unlock_new_inode(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700254out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700255 if (!err)
256 err = nilfs_transaction_commit(dir->i_sb);
257 else
258 nilfs_transaction_abort(dir->i_sb);
259
260 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700261
262out_fail:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900263 drop_nlink(inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900264 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900265 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800266 unlock_new_inode(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700267 iput(inode);
268out_dir:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900269 drop_nlink(dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900270 nilfs_mark_inode_dirty(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700271 goto out;
272}
273
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900274static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700275{
276 struct inode *inode;
277 struct nilfs_dir_entry *de;
278 struct page *page;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700279 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700280
Ryusuke Konishid2500652009-04-06 19:01:34 -0700281 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500282 de = nilfs_find_entry(dir, &dentry->d_name, &page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700283 if (!de)
284 goto out;
285
David Howells2b0143b2015-03-17 22:25:59 +0000286 inode = d_inode(dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700287 err = -EIO;
288 if (le64_to_cpu(de->inode) != inode->i_ino)
289 goto out;
290
291 if (!inode->i_nlink) {
292 nilfs_warning(inode->i_sb, __func__,
293 "deleting nonexistent file (%lu), %d\n",
294 inode->i_ino, inode->i_nlink);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200295 set_nlink(inode, 1);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700296 }
297 err = nilfs_delete_entry(de, page);
298 if (err)
299 goto out;
300
301 inode->i_ctime = dir->i_ctime;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900302 drop_nlink(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700303 err = 0;
304out:
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900305 return err;
306}
307
308static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
309{
310 struct nilfs_transaction_info ti;
311 int err;
312
313 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
314 if (err)
315 return err;
316
317 err = nilfs_do_unlink(dir, dentry);
318
319 if (!err) {
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900320 nilfs_mark_inode_dirty(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000321 nilfs_mark_inode_dirty(d_inode(dentry));
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700322 err = nilfs_transaction_commit(dir->i_sb);
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900323 } else
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700324 nilfs_transaction_abort(dir->i_sb);
325
326 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700327}
328
329static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
330{
David Howells2b0143b2015-03-17 22:25:59 +0000331 struct inode *inode = d_inode(dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700332 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700333 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700334
335 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
336 if (err)
337 return err;
338
339 err = -ENOTEMPTY;
340 if (nilfs_empty_dir(inode)) {
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900341 err = nilfs_do_unlink(dir, dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700342 if (!err) {
343 inode->i_size = 0;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900344 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900345 nilfs_mark_inode_dirty(inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900346 drop_nlink(dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900347 nilfs_mark_inode_dirty(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700348 }
349 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700350 if (!err)
351 err = nilfs_transaction_commit(dir->i_sb);
352 else
353 nilfs_transaction_abort(dir->i_sb);
354
355 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700356}
357
358static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
359 struct inode *new_dir, struct dentry *new_dentry)
360{
David Howells2b0143b2015-03-17 22:25:59 +0000361 struct inode *old_inode = d_inode(old_dentry);
362 struct inode *new_inode = d_inode(new_dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700363 struct page *dir_page = NULL;
364 struct nilfs_dir_entry *dir_de = NULL;
365 struct page *old_page;
366 struct nilfs_dir_entry *old_de;
367 struct nilfs_transaction_info ti;
368 int err;
369
370 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
371 if (unlikely(err))
372 return err;
373
374 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500375 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700376 if (!old_de)
377 goto out;
378
379 if (S_ISDIR(old_inode->i_mode)) {
380 err = -EIO;
381 dir_de = nilfs_dotdot(old_inode, &dir_page);
382 if (!dir_de)
383 goto out_old;
384 }
385
386 if (new_inode) {
387 struct page *new_page;
388 struct nilfs_dir_entry *new_de;
389
390 err = -ENOTEMPTY;
391 if (dir_de && !nilfs_empty_dir(new_inode))
392 goto out_dir;
393
394 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500395 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700396 if (!new_de)
397 goto out_dir;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700398 nilfs_set_link(new_dir, new_de, new_page, old_inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900399 nilfs_mark_inode_dirty(new_dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700400 new_inode->i_ctime = CURRENT_TIME;
401 if (dir_de)
402 drop_nlink(new_inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900403 drop_nlink(new_inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900404 nilfs_mark_inode_dirty(new_inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700405 } else {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700406 err = nilfs_add_link(new_dentry, old_inode);
Al Viro30eb43d2011-03-02 12:01:13 -0500407 if (err)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700408 goto out_dir;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900409 if (dir_de) {
410 inc_nlink(new_dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900411 nilfs_mark_inode_dirty(new_dir);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900412 }
Ryusuke Konishid2500652009-04-06 19:01:34 -0700413 }
414
415 /*
416 * Like most other Unix systems, set the ctime for inodes on a
417 * rename.
Ryusuke Konishid2500652009-04-06 19:01:34 -0700418 */
419 old_inode->i_ctime = CURRENT_TIME;
420
421 nilfs_delete_entry(old_de, old_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700422
423 if (dir_de) {
424 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900425 drop_nlink(old_dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700426 }
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900427 nilfs_mark_inode_dirty(old_dir);
428 nilfs_mark_inode_dirty(old_inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700429
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700430 err = nilfs_transaction_commit(old_dir->i_sb);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700431 return err;
432
433out_dir:
434 if (dir_de) {
435 kunmap(dir_page);
436 page_cache_release(dir_page);
437 }
438out_old:
439 kunmap(old_page);
440 page_cache_release(old_page);
441out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700442 nilfs_transaction_abort(old_dir->i_sb);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700443 return err;
444}
445
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900446/*
447 * Export operations
448 */
449static struct dentry *nilfs_get_parent(struct dentry *child)
450{
451 unsigned long ino;
452 struct inode *inode;
Linus Torvalds26fe5752012-05-10 13:14:12 -0700453 struct qstr dotdot = QSTR_INIT("..", 2);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900454 struct nilfs_root *root;
455
David Howells2b0143b2015-03-17 22:25:59 +0000456 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900457 if (!ino)
458 return ERR_PTR(-ENOENT);
459
David Howells2b0143b2015-03-17 22:25:59 +0000460 root = NILFS_I(d_inode(child))->i_root;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900461
David Howells2b0143b2015-03-17 22:25:59 +0000462 inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900463 if (IS_ERR(inode))
464 return ERR_CAST(inode);
465
466 return d_obtain_alias(inode);
467}
468
469static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
470 u64 ino, u32 gen)
471{
472 struct nilfs_root *root;
473 struct inode *inode;
474
475 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
476 return ERR_PTR(-ESTALE);
477
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900478 root = nilfs_lookup_root(sb->s_fs_info, cno);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900479 if (!root)
480 return ERR_PTR(-ESTALE);
481
482 inode = nilfs_iget(sb, root, ino);
483 nilfs_put_root(root);
484
485 if (IS_ERR(inode))
486 return ERR_CAST(inode);
487 if (gen && inode->i_generation != gen) {
488 iput(inode);
489 return ERR_PTR(-ESTALE);
490 }
491 return d_obtain_alias(inode);
492}
493
494static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
495 int fh_len, int fh_type)
496{
497 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
498
NeilBrownf73c2f12015-06-25 15:03:45 -0700499 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900500 (fh_type != FILEID_NILFS_WITH_PARENT &&
501 fh_type != FILEID_NILFS_WITHOUT_PARENT))
502 return NULL;
503
504 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
505}
506
507static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
508 int fh_len, int fh_type)
509{
510 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
511
NeilBrownf73c2f12015-06-25 15:03:45 -0700512 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900513 fh_type != FILEID_NILFS_WITH_PARENT)
514 return NULL;
515
516 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
517}
518
Al Virob0b03822012-04-02 14:34:06 -0400519static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
520 struct inode *parent)
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900521{
522 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900523 struct nilfs_root *root = NILFS_I(inode)->i_root;
524 int type;
525
Al Virob0b03822012-04-02 14:34:06 -0400526 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
527 *lenp = NILFS_FID_SIZE_CONNECTABLE;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900528 return FILEID_INVALID;
Al Virob0b03822012-04-02 14:34:06 -0400529 }
530 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
531 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900532 return FILEID_INVALID;
Al Virob0b03822012-04-02 14:34:06 -0400533 }
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900534
535 fid->cno = root->cno;
536 fid->ino = inode->i_ino;
537 fid->gen = inode->i_generation;
538
Al Virob0b03822012-04-02 14:34:06 -0400539 if (parent) {
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900540 fid->parent_ino = parent->i_ino;
541 fid->parent_gen = parent->i_generation;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900542 type = FILEID_NILFS_WITH_PARENT;
543 *lenp = NILFS_FID_SIZE_CONNECTABLE;
544 } else {
545 type = FILEID_NILFS_WITHOUT_PARENT;
546 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
547 }
548
549 return type;
550}
551
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700552const struct inode_operations nilfs_dir_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700553 .create = nilfs_create,
554 .lookup = nilfs_lookup,
555 .link = nilfs_link,
556 .unlink = nilfs_unlink,
557 .symlink = nilfs_symlink,
558 .mkdir = nilfs_mkdir,
559 .rmdir = nilfs_rmdir,
560 .mknod = nilfs_mknod,
561 .rename = nilfs_rename,
562 .setattr = nilfs_setattr,
563 .permission = nilfs_permission,
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900564 .fiemap = nilfs_fiemap,
Ryusuke Konishid2500652009-04-06 19:01:34 -0700565};
566
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700567const struct inode_operations nilfs_special_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700568 .setattr = nilfs_setattr,
569 .permission = nilfs_permission,
570};
571
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700572const struct inode_operations nilfs_symlink_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700573 .readlink = generic_readlink,
574 .follow_link = page_follow_link_light,
575 .put_link = page_put_link,
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900576 .permission = nilfs_permission,
Ryusuke Konishid2500652009-04-06 19:01:34 -0700577};
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900578
579const struct export_operations nilfs_export_ops = {
580 .encode_fh = nilfs_encode_fh,
581 .fh_to_dentry = nilfs_fh_to_dentry,
582 .fh_to_parent = nilfs_fh_to_parent,
583 .get_parent = nilfs_get_parent,
584};